Parameters Analysis on Flexural Strength of Sisal Fibre Reinforced Mortar: the Effect of Fiber Length

Abstract

Sisal fibre is an environmentally degradable material, with a higher tensile strength, it is often used to improve the mechanical properties of cement-based composites. To investigate the influence of sisal fibre size on the mechanical strength of mortar, first, the sisal fibre fraction was kept constant (0.13 wt.%), several different lengths (0 to 40 mm) of sisal fibre were mixed into the mortar matrix, the flexural test results showed that the optimum sisal fibre length was 30 mm. Second, the regression analysis was conducted to further research the influence of sisal fibre length on the flexural strength at varied curing ages (7, 14, and 28 days), and the related shape and scalar parameters to predict the flexural strength of composites were attained. Finally, with the fitting parameters, the corresponding probability density functions were determined. From the fitting results, it showed that the lnln(1/p) was linearly correlated to the ln(fb), and the sisal fibre length may increase the scatter of the experimental data.